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www.khanacademy.org/math/pre-algebra/fractions-pre-alg/fractions-unlike-denom-pre-alg/v/adding-fractions-with-unlike-denominators

To solve this problem, we need to find the least common multiple to get at the common denominator. Can you help? We bet you can!

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May 2, 2012 ... Adding fractions with different denominators, step by step, examples. For more
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Calculator for

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A

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Nov 3, 2014

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Practice

Answer

To add or subtract fractions, they must have the same denominator. If they do not, make the least common multiple of all of the denominators the new denominator. After adding or subtracting, reduce your answer.

When giving the fractions like denominators, whatever number you multiply the old denominator of a fraction by, you must also multiply it by the numerator.

Sources:

See Also:
Least Common Denominators

More Info

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Practice

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This prealgebra lesson explains how to